Improvement in middlings-separators



W. 85N. THAYBR.

, Middlingseparators.

Patented May 2o, 1879.

UNITED STATES PATENT OFTIon` WILLIAM IHAYER ANDl NEWTON THAYER, OF WESTERVILLE, OHIO.

IMPROVEMENT IN MID'DLlNes-sl-:PARAToRs Specilication forming part of Letters Patent No. 215,491, dated May 20, 1879 application filed July 18, 1878.

To all whom t may concern:

Be it known that we, WILLIAM THAYER and NEWTON THAYER, of Westerville, in the county of Franklin, in the Stateof Ohio, have invented a new and useful Improvement in the Process of Purifying Middlings, which process is fully set forth in the following specification.

Our invention is an improvement in mid- V dlings-puriers; and has for its object to provide an arrangement for agitating the products of the mill, in which there is less than ordinary frictional and vibratory wear, by substituting certain novel devices for directing and controlling the air-blast induced by the fan or blower.

It consists in the arrangement, within a case, of a series of valves under the control of the operator, located at suitable points with reference to a sieve, and the blower provided with valves, which may be opened or closed to weaken or strengthen the draft at given points, and thus retard or quicken the movement of the middlings, as it may be necessary to throw out impurities or coarse stock while the middlin gs are circulating with the currents of air induced by the blower.

It consists, also, in providing, in connection with the sieve and the system of valves and drop one grade of the valuable part of the `middlings from its circuit.

In our drawings, Figure l is a sectional view of our machine. Fig. 2 is a plan view of same, with the case broken away to show some of the interior arrangements.

Similar reference-letters indicate like parts in all of the figures.

Referring to the drawings, A is the case, rectangular in general form, provided at one end with a hopper, A, to receive the middlings to be purified. C is a tube' extending from said hopper into the case, through which the middlings pass toward the boXVB. A shaft, a, hung in proper journal-bearings attached to the case, passes through the tube G, and has fixed uponits upper enda pulley, driven by a belt communicating with the applied power Vto move said shaft a, and with it a disk, D,

which is intended to feed the middlings into the box B. At the opposite end of the case A is located a blower, K, which is caused to revolve by suitable gearing connected with a pulley fixed on the shaft b, which shaft forms the vairis of said blower.

By the movement of the blower or fan K, currents of air are induced in the direction of the arrows l 2 from the chamber F and box B-the one following the arrows l by way of the passage-way G, on through the blower, and out through the opening m, while that following arrows 2 moves over the vacuum-chamber I, through valve c', and out through said opening m.

Chamber F, box B, and passage-way G are provided with valves .E El E2 E3., properly hinged, which, under control of the attendant,

,are opened and closed to strengthen or weaken the blast at proper places in the currents, in order that the impurities may be drawn off, while the coarser are separated from the finer middlings.

In connection with the arrangement de scribed, we provide a vacuum-chamber, I,which we locate at a suitable point with reference to the fan, into which the purified middlings of one grade drop on their passage in the cur rent .of arrows 2, from which they are conveyed.

In connection with the parts already described, we provide also an inclined sieve, I-I, which we locate on one side of a hopper, L, centrally fixed in the case. This sieve His vibrated by an eccentric fixed on the shaft b as said shaft revolves about its axis.

Through hopper L passes a shaft, J, provided with a revolving disk, D', which is moved by suitable gearing connected with the applied power. Extending from the hopper L, and surrounding the shaft e, is a tube, which conveys the middlings which have passed through thesieve by way of disk Dl into the chamber F, whence they are drawn again by the current ascending in the direction of arrows 2 and on the heavy particles dropping into chamber I, while the lighter pass out through valve c and opening m of the fandrum. y

To recapitulate and more fully illustrate the operation of our machine, we will suppose the middlings to be entering the hopper A, and passing through the spout O into t-he box B, while the blower is in operation simulta` neously with the movement ofthe shafts a and l 2115.1E9i

J. By reducing the space in the box B by adjusting the valves E El, the current is greatly strengthened, so that the entire mass received, excepting the heaviest middlings, which fall through the open bottom of air-box B, will be drawn rapidly upward, and thence, in the direction of the arrows l, over the sieve. The valve E2 regulating the current here, the second grade of middlings will drop onto the sieve, the heavier particles passing through it into the hopper L, while the coarse deleterious matter will pass over and be drawn oft' by the fan. rlhe middlings coming through the sieve, gravitatin g downward through spout C', after passing the disk D', are met by thecurrent moving in the direction of the arrows 2, are agitated, and the lighter drawn upward over the vacuurnchamberl, where the heavier particles of this portion drop, while the lighter pass through valve-openin g c, and out through the opening in of the blower-drum.

By contracting the lower end of the air-box B, the strength of the current of air at the bottom will be increased suiiiciently to hold the middlings suspended, to cause a thorough agitation and separation before being drawn olil toward the passage-way G.

The openings in the upper part ofthe blowerdrum are provided with valves c d, which may be adjusted independently of each other, to regulate the blast induced by the action ofthe blower-fan'. t

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

l. The box B, having valves E E1, and provided with tube C and disk D, in combination with chamber G, provided with valve E2, located above the plane of disk D, vibratingl sieve H over hopper L, and blower K, all arranged as described, for the purpose set forth.

2. In combination with sieve H and hopper L, the chamber F, having valve E3, and provided with tube C' and disk D', vacuum-chamber l', having its mouth above the plane of disk D', and blower K, substantially as and for the purpose set forth.

3. rlhe blower K, provided with independent valves c and d, to modifyseparately the currents coming over and under sieve H, as and for the purpose set forth.

4. ln combination with blower K, the box B and chambers G and F, said blo wer-box and chambers being located as described, and provided, respectively, with valves to regulate ai r-currents in purifying middlings.

5. In a machine for purifying middlin gs, the

blower IK, chamber F, with valve E3, vacuunichamber I, box B, provided with valves El E, passageway G, with valve E2, and sieve H, all arranged substantially as and for the purpose set forth.

VILLIAM THAYER. N. THAYEB.

Witnesses R. R. ARNoLD, J osEPH F. FRicK. 

